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#include <bits/stdc++.h>

using namespace std;
int k,n,i,j,b,w,z;
vector<vector<int>> a,v;
int main(){
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	a={{}};
	v={{}};
	cin >> k >> n;
	for(i=0;i<n;i++) {a[0].push_back(0); v[0].push_back(0);}
	for(i=1;i<k;i++) {
		a.push_back({});
		v.push_back({});
		cin >> n;
		for(j=0;j<n;j++) {
			cin >> b;
			a[i].push_back(b);
			v[i].push_back(0);
		}
	}
	w=0;
	for(i=k-1;i>=0;i--) {
		z=0;
		for(j=0;j<a[i].size();j++){
			if(v[i][j]==0) v[i][j]=1;
			z+=v[i][j];
			if(i>0 and a[i][j]>0) v[i-1][a[i][j]-1]+=v[i][j];
			
		}
		w=max(w,z);
	}
	cout << w << '\n';
}